Door-spring



(Model.)

R. H. WILES.

DOOR SPRING.

N0. 251,082. Patented Dec. 20,1881.

UNITED STATES PATENT OFFICE.

ROBERT H. WVILES, OF FREEPORT, ILLINOIS.

DOOR-SPRING.

SPEGIFIOATION formng part of Letters Patent 1\To. 251,082, dated December 20, 1881.

Application filed February 17, 1881. (Model) T0 all 1vhom it may concern Be it known that I, ROBERT H. WILES, aeitizen of the United States. residing at Freeport, in the county of Stephenson and State of Iilinois, have invented a new and nsetul Im provement in Door-Springs, of which the fullowing is a specifiention.

My invention relates to that eiass of doorsprings whieh tend t0 close the door until it has been opencd to a certain nngie, and after it; has reaehed that angle tend to hold it open. It is a double-acting spring, s0 called, and holds the door open afLer it: has been moved through an angle of aboni: one hundred and thirby degrees.

The construction of the spxing and manner of attaching it are shown in the aeeompanying drawings, in which the same letters represent similar parts in ai1 the figures.

Figure 1 is n view of the spring and its attachments in perspeetive. Fig. 2 shows the spring in projection as seen fr01n below. Fig. 3 shows the spring in projection as seen from above.

In Fig. 1, M rvpresents the door, N the jamb, and 2 2 the haif-hinge or other equivaleut device by which the spring is attached to the door and jamb.

In all the fignres T represents the end of the spring whieh is attached to the jamb; x, the extremity whieh is attaehed to the door; U, the inner coil of the spring, and w the onter coil of the spring.

The spring consists of a single wire wonnd intea. spiral of any given number of eoils, aboui; which spiral the same wire is w0und in asecond spiral, the inner eoil serving as a core for the outer, and the outer acting as a case 01 barrelfor the inner, and eaeh strengthening and stifl'ening the other. In the spring as shown in Fig. 1 the inner c0ii is wound from the lower end npwnrd until a sufteient number of turns have been formed, when the wire is wound arennd the inner eoil, beginningat ihe t0p and proceeding downward until the outer spira1 is of the length desired. The ends of the spring are left straight, and may be of any desirerl length. These ends are bent at right angles, as shown al: T and x, forming pivets, w'hieh are inserted in half-hingesz z, orequivaleni: fastenings.

The operation of the spring is evident. As the door opens, the distanee between the ends of the spring is increased, nnd Lhe'eoils are ightened in consequence,nntil the points of attaehment and the hinge pin of the door are in the same plane, whieh ocehrs when the door is opened aboub one hund'red and thirty de grees. If the door De opened stil] farlher, the distance between the. puiuts of attaehment deereases, and the door is consequentl y held open by the f0ree of the spring.

I am awnre that ether door-springs are made Whieh aei: in substnntially the sune manner as the one described ahove, and .hat the manner ofattnehment shown hereinis in common nse.

\Vhat I de claim, therefore, as my invention, and desire to secure by Letters Patent of the United States, is

A door-spring formed entixeiy of a single wire wound in spirais, one eoil of whieh is wilhin and furms u eore, nnd haring prujectng ends of suitahle length for atia(:hing into the door and jzunb, substnntially as deseribed.

ROBERT H. WILES.

Witnesses:

A. W. GREENE, F. W. BRAINERD. 

